| /* |
| * ALSA input and output |
| * Copyright (c) 2007 Luca Abeni ( lucabe72 email it ) |
| * Copyright (c) 2007 Benoit Fouet ( benoit fouet free fr ) |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * ALSA input and output: common code |
| * @author Luca Abeni ( lucabe72 email it ) |
| * @author Benoit Fouet ( benoit fouet free fr ) |
| * @author Nicolas George ( nicolas george normalesup org ) |
| */ |
| |
| #include <alsa/asoundlib.h> |
| #include "avdevice.h" |
| #include "libavutil/avassert.h" |
| #include "libavutil/channel_layout.h" |
| |
| #include "alsa.h" |
| |
| static av_cold snd_pcm_format_t codec_id_to_pcm_format(int codec_id) |
| { |
| switch(codec_id) { |
| case AV_CODEC_ID_PCM_F64LE: return SND_PCM_FORMAT_FLOAT64_LE; |
| case AV_CODEC_ID_PCM_F64BE: return SND_PCM_FORMAT_FLOAT64_BE; |
| case AV_CODEC_ID_PCM_F32LE: return SND_PCM_FORMAT_FLOAT_LE; |
| case AV_CODEC_ID_PCM_F32BE: return SND_PCM_FORMAT_FLOAT_BE; |
| case AV_CODEC_ID_PCM_S32LE: return SND_PCM_FORMAT_S32_LE; |
| case AV_CODEC_ID_PCM_S32BE: return SND_PCM_FORMAT_S32_BE; |
| case AV_CODEC_ID_PCM_U32LE: return SND_PCM_FORMAT_U32_LE; |
| case AV_CODEC_ID_PCM_U32BE: return SND_PCM_FORMAT_U32_BE; |
| case AV_CODEC_ID_PCM_S24LE: return SND_PCM_FORMAT_S24_3LE; |
| case AV_CODEC_ID_PCM_S24BE: return SND_PCM_FORMAT_S24_3BE; |
| case AV_CODEC_ID_PCM_U24LE: return SND_PCM_FORMAT_U24_3LE; |
| case AV_CODEC_ID_PCM_U24BE: return SND_PCM_FORMAT_U24_3BE; |
| case AV_CODEC_ID_PCM_S16LE: return SND_PCM_FORMAT_S16_LE; |
| case AV_CODEC_ID_PCM_S16BE: return SND_PCM_FORMAT_S16_BE; |
| case AV_CODEC_ID_PCM_U16LE: return SND_PCM_FORMAT_U16_LE; |
| case AV_CODEC_ID_PCM_U16BE: return SND_PCM_FORMAT_U16_BE; |
| case AV_CODEC_ID_PCM_S8: return SND_PCM_FORMAT_S8; |
| case AV_CODEC_ID_PCM_U8: return SND_PCM_FORMAT_U8; |
| case AV_CODEC_ID_PCM_MULAW: return SND_PCM_FORMAT_MU_LAW; |
| case AV_CODEC_ID_PCM_ALAW: return SND_PCM_FORMAT_A_LAW; |
| default: return SND_PCM_FORMAT_UNKNOWN; |
| } |
| } |
| |
| #define MAKE_REORDER_FUNC(NAME, TYPE, CHANNELS, LAYOUT, MAP) \ |
| static void alsa_reorder_ ## NAME ## _ ## LAYOUT(const void *in_v, \ |
| void *out_v, \ |
| int n) \ |
| { \ |
| const TYPE *in = in_v; \ |
| TYPE *out = out_v; \ |
| \ |
| while (n-- > 0) { \ |
| MAP \ |
| in += CHANNELS; \ |
| out += CHANNELS; \ |
| } \ |
| } |
| |
| #define MAKE_REORDER_FUNCS(CHANNELS, LAYOUT, MAP) \ |
| MAKE_REORDER_FUNC(int8, int8_t, CHANNELS, LAYOUT, MAP) \ |
| MAKE_REORDER_FUNC(int16, int16_t, CHANNELS, LAYOUT, MAP) \ |
| MAKE_REORDER_FUNC(int32, int32_t, CHANNELS, LAYOUT, MAP) \ |
| MAKE_REORDER_FUNC(f32, float, CHANNELS, LAYOUT, MAP) |
| |
| MAKE_REORDER_FUNCS(5, out_50, \ |
| out[0] = in[0]; \ |
| out[1] = in[1]; \ |
| out[2] = in[3]; \ |
| out[3] = in[4]; \ |
| out[4] = in[2]; \ |
| ) |
| |
| MAKE_REORDER_FUNCS(6, out_51, \ |
| out[0] = in[0]; \ |
| out[1] = in[1]; \ |
| out[2] = in[4]; \ |
| out[3] = in[5]; \ |
| out[4] = in[2]; \ |
| out[5] = in[3]; \ |
| ) |
| |
| MAKE_REORDER_FUNCS(8, out_71, \ |
| out[0] = in[0]; \ |
| out[1] = in[1]; \ |
| out[2] = in[4]; \ |
| out[3] = in[5]; \ |
| out[4] = in[2]; \ |
| out[5] = in[3]; \ |
| out[6] = in[6]; \ |
| out[7] = in[7]; \ |
| ) |
| |
| #define FORMAT_I8 0 |
| #define FORMAT_I16 1 |
| #define FORMAT_I32 2 |
| #define FORMAT_F32 3 |
| |
| #define PICK_REORDER(layout)\ |
| switch(format) {\ |
| case FORMAT_I8: s->reorder_func = alsa_reorder_int8_out_ ##layout; break;\ |
| case FORMAT_I16: s->reorder_func = alsa_reorder_int16_out_ ##layout; break;\ |
| case FORMAT_I32: s->reorder_func = alsa_reorder_int32_out_ ##layout; break;\ |
| case FORMAT_F32: s->reorder_func = alsa_reorder_f32_out_ ##layout; break;\ |
| } |
| |
| static av_cold int find_reorder_func(AlsaData *s, int codec_id, uint64_t layout, int out) |
| { |
| int format; |
| |
| /* reordering input is not currently supported */ |
| if (!out) |
| return AVERROR(ENOSYS); |
| |
| /* reordering is not needed for QUAD or 2_2 layout */ |
| if (layout == AV_CH_LAYOUT_QUAD || layout == AV_CH_LAYOUT_2_2) |
| return 0; |
| |
| switch (codec_id) { |
| case AV_CODEC_ID_PCM_S8: |
| case AV_CODEC_ID_PCM_U8: |
| case AV_CODEC_ID_PCM_ALAW: |
| case AV_CODEC_ID_PCM_MULAW: format = FORMAT_I8; break; |
| case AV_CODEC_ID_PCM_S16LE: |
| case AV_CODEC_ID_PCM_S16BE: |
| case AV_CODEC_ID_PCM_U16LE: |
| case AV_CODEC_ID_PCM_U16BE: format = FORMAT_I16; break; |
| case AV_CODEC_ID_PCM_S32LE: |
| case AV_CODEC_ID_PCM_S32BE: |
| case AV_CODEC_ID_PCM_U32LE: |
| case AV_CODEC_ID_PCM_U32BE: format = FORMAT_I32; break; |
| case AV_CODEC_ID_PCM_F32LE: |
| case AV_CODEC_ID_PCM_F32BE: format = FORMAT_F32; break; |
| default: return AVERROR(ENOSYS); |
| } |
| |
| if (layout == AV_CH_LAYOUT_5POINT0_BACK || layout == AV_CH_LAYOUT_5POINT0) |
| PICK_REORDER(50) |
| else if (layout == AV_CH_LAYOUT_5POINT1_BACK || layout == AV_CH_LAYOUT_5POINT1) |
| PICK_REORDER(51) |
| else if (layout == AV_CH_LAYOUT_7POINT1) |
| PICK_REORDER(71) |
| |
| return s->reorder_func ? 0 : AVERROR(ENOSYS); |
| } |
| |
| av_cold int ff_alsa_open(AVFormatContext *ctx, snd_pcm_stream_t mode, |
| unsigned int *sample_rate, |
| int channels, enum AVCodecID *codec_id) |
| { |
| AlsaData *s = ctx->priv_data; |
| const char *audio_device; |
| int res, flags = 0; |
| snd_pcm_format_t format; |
| snd_pcm_t *h; |
| snd_pcm_hw_params_t *hw_params; |
| snd_pcm_uframes_t buffer_size, period_size; |
| uint64_t layout = ctx->streams[0]->codecpar->channel_layout; |
| |
| if (ctx->url[0] == 0) audio_device = "default"; |
| else audio_device = ctx->url; |
| |
| if (*codec_id == AV_CODEC_ID_NONE) |
| *codec_id = DEFAULT_CODEC_ID; |
| format = codec_id_to_pcm_format(*codec_id); |
| if (format == SND_PCM_FORMAT_UNKNOWN) { |
| av_log(ctx, AV_LOG_ERROR, "sample format 0x%04x is not supported\n", *codec_id); |
| return AVERROR(ENOSYS); |
| } |
| s->frame_size = av_get_bits_per_sample(*codec_id) / 8 * channels; |
| |
| if (ctx->flags & AVFMT_FLAG_NONBLOCK) { |
| flags = SND_PCM_NONBLOCK; |
| } |
| res = snd_pcm_open(&h, audio_device, mode, flags); |
| if (res < 0) { |
| av_log(ctx, AV_LOG_ERROR, "cannot open audio device %s (%s)\n", |
| audio_device, snd_strerror(res)); |
| return AVERROR(EIO); |
| } |
| |
| res = snd_pcm_hw_params_malloc(&hw_params); |
| if (res < 0) { |
| av_log(ctx, AV_LOG_ERROR, "cannot allocate hardware parameter structure (%s)\n", |
| snd_strerror(res)); |
| goto fail1; |
| } |
| |
| res = snd_pcm_hw_params_any(h, hw_params); |
| if (res < 0) { |
| av_log(ctx, AV_LOG_ERROR, "cannot initialize hardware parameter structure (%s)\n", |
| snd_strerror(res)); |
| goto fail; |
| } |
| |
| res = snd_pcm_hw_params_set_access(h, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED); |
| if (res < 0) { |
| av_log(ctx, AV_LOG_ERROR, "cannot set access type (%s)\n", |
| snd_strerror(res)); |
| goto fail; |
| } |
| |
| res = snd_pcm_hw_params_set_format(h, hw_params, format); |
| if (res < 0) { |
| av_log(ctx, AV_LOG_ERROR, "cannot set sample format 0x%04x %d (%s)\n", |
| *codec_id, format, snd_strerror(res)); |
| goto fail; |
| } |
| |
| res = snd_pcm_hw_params_set_rate_near(h, hw_params, sample_rate, 0); |
| if (res < 0) { |
| av_log(ctx, AV_LOG_ERROR, "cannot set sample rate (%s)\n", |
| snd_strerror(res)); |
| goto fail; |
| } |
| |
| res = snd_pcm_hw_params_set_channels(h, hw_params, channels); |
| if (res < 0) { |
| av_log(ctx, AV_LOG_ERROR, "cannot set channel count to %d (%s)\n", |
| channels, snd_strerror(res)); |
| goto fail; |
| } |
| |
| snd_pcm_hw_params_get_buffer_size_max(hw_params, &buffer_size); |
| buffer_size = FFMIN(buffer_size, ALSA_BUFFER_SIZE_MAX); |
| /* TODO: maybe use ctx->max_picture_buffer somehow */ |
| res = snd_pcm_hw_params_set_buffer_size_near(h, hw_params, &buffer_size); |
| if (res < 0) { |
| av_log(ctx, AV_LOG_ERROR, "cannot set ALSA buffer size (%s)\n", |
| snd_strerror(res)); |
| goto fail; |
| } |
| |
| snd_pcm_hw_params_get_period_size_min(hw_params, &period_size, NULL); |
| if (!period_size) |
| period_size = buffer_size / 4; |
| res = snd_pcm_hw_params_set_period_size_near(h, hw_params, &period_size, NULL); |
| if (res < 0) { |
| av_log(ctx, AV_LOG_ERROR, "cannot set ALSA period size (%s)\n", |
| snd_strerror(res)); |
| goto fail; |
| } |
| s->period_size = period_size; |
| |
| res = snd_pcm_hw_params(h, hw_params); |
| if (res < 0) { |
| av_log(ctx, AV_LOG_ERROR, "cannot set parameters (%s)\n", |
| snd_strerror(res)); |
| goto fail; |
| } |
| |
| snd_pcm_hw_params_free(hw_params); |
| |
| if (channels > 2 && layout) { |
| if (find_reorder_func(s, *codec_id, layout, mode == SND_PCM_STREAM_PLAYBACK) < 0) { |
| char name[128]; |
| av_get_channel_layout_string(name, sizeof(name), channels, layout); |
| av_log(ctx, AV_LOG_WARNING, "ALSA channel layout unknown or unimplemented for %s %s.\n", |
| name, mode == SND_PCM_STREAM_PLAYBACK ? "playback" : "capture"); |
| } |
| if (s->reorder_func) { |
| s->reorder_buf_size = buffer_size; |
| s->reorder_buf = av_malloc_array(s->reorder_buf_size, s->frame_size); |
| if (!s->reorder_buf) |
| goto fail1; |
| } |
| } |
| |
| s->h = h; |
| return 0; |
| |
| fail: |
| snd_pcm_hw_params_free(hw_params); |
| fail1: |
| snd_pcm_close(h); |
| return AVERROR(EIO); |
| } |
| |
| av_cold int ff_alsa_close(AVFormatContext *s1) |
| { |
| AlsaData *s = s1->priv_data; |
| |
| snd_pcm_nonblock(s->h, 0); |
| snd_pcm_drain(s->h); |
| av_freep(&s->reorder_buf); |
| if (CONFIG_ALSA_INDEV) |
| ff_timefilter_destroy(s->timefilter); |
| snd_pcm_close(s->h); |
| return 0; |
| } |
| |
| int ff_alsa_xrun_recover(AVFormatContext *s1, int err) |
| { |
| AlsaData *s = s1->priv_data; |
| snd_pcm_t *handle = s->h; |
| |
| av_log(s1, AV_LOG_WARNING, "ALSA buffer xrun.\n"); |
| if (err == -EPIPE) { |
| err = snd_pcm_prepare(handle); |
| if (err < 0) { |
| av_log(s1, AV_LOG_ERROR, "cannot recover from underrun (snd_pcm_prepare failed: %s)\n", snd_strerror(err)); |
| |
| return AVERROR(EIO); |
| } |
| } else if (err == -ESTRPIPE) { |
| av_log(s1, AV_LOG_ERROR, "-ESTRPIPE... Unsupported!\n"); |
| |
| return -1; |
| } |
| return err; |
| } |
| |
| int ff_alsa_extend_reorder_buf(AlsaData *s, int min_size) |
| { |
| int size = s->reorder_buf_size; |
| void *r; |
| |
| av_assert0(size != 0); |
| while (size < min_size) |
| size *= 2; |
| r = av_realloc_array(s->reorder_buf, size, s->frame_size); |
| if (!r) |
| return AVERROR(ENOMEM); |
| s->reorder_buf = r; |
| s->reorder_buf_size = size; |
| return 0; |
| } |
| |
| /* ported from alsa-utils/aplay.c */ |
| int ff_alsa_get_device_list(AVDeviceInfoList *device_list, snd_pcm_stream_t stream_type) |
| { |
| int ret = 0; |
| void **hints, **n; |
| char *name = NULL, *descr = NULL, *io = NULL, *tmp; |
| AVDeviceInfo *new_device = NULL; |
| const char *filter = stream_type == SND_PCM_STREAM_PLAYBACK ? "Output" : "Input"; |
| |
| if (snd_device_name_hint(-1, "pcm", &hints) < 0) |
| return AVERROR_EXTERNAL; |
| n = hints; |
| while (*n && !ret) { |
| name = snd_device_name_get_hint(*n, "NAME"); |
| descr = snd_device_name_get_hint(*n, "DESC"); |
| io = snd_device_name_get_hint(*n, "IOID"); |
| if (!io || !strcmp(io, filter)) { |
| new_device = av_mallocz(sizeof(AVDeviceInfo)); |
| if (!new_device) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| new_device->device_name = av_strdup(name); |
| if ((tmp = strrchr(descr, '\n')) && tmp[1]) |
| new_device->device_description = av_strdup(&tmp[1]); |
| else |
| new_device->device_description = av_strdup(descr); |
| if (!new_device->device_description || !new_device->device_name) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| if ((ret = av_dynarray_add_nofree(&device_list->devices, |
| &device_list->nb_devices, new_device)) < 0) { |
| goto fail; |
| } |
| if (!strcmp(new_device->device_name, "default")) |
| device_list->default_device = device_list->nb_devices - 1; |
| new_device = NULL; |
| } |
| fail: |
| free(io); |
| free(name); |
| free(descr); |
| n++; |
| } |
| if (new_device) { |
| av_free(new_device->device_description); |
| av_free(new_device->device_name); |
| av_free(new_device); |
| } |
| snd_device_name_free_hint(hints); |
| return ret; |
| } |
